Doorcheck



Jan. 7, 1936. M HE NGWAY 2,027,170 7 I DooRcHEecK Filed May 20, 1935Patented Jan. 7, 1936.

UNITED STATES PATENT OFFICE 1 Claim.

Fig. 1 is a front view of a door-check constructed in accordance withthis invention and shown as applied to adoor;

Fig. 2 is a vertical sectional view on an enlarged 15 scale;

Fig. 3 is a sectional view on the line 3--3 of Fig. 2;

Fig. 4 is a sectional view on the line 4-4 of Fig. 2; and

20 Fig. 5 is a perspective view of the piston, de-

tached.

In carrying out this invention, a shell I is employed, which is providedwith a bracket II, by which it may be attached to a door. In the shell25 is a cup-shaped piston I2 having a port I3 in the bottom, which isnormally closed by a spring valve I4. In one side is a vertical slot Iand in the opposite side is an opening I 6, and from the opening I6 aby-pass I1 extends to the bottom of 30 the piston. The piston issupported in its downward position by a boss I8 formed in the bottom ofthe shell I 0. Mounted in the shell, in line with the by-pass, is ascrew 36 having a pointed end 31 extending into the by-pass.

Mounted upon a pin I9 attached to the piston is a roller 20, and enteredinto the back of the shell is a screw-plug 2! having a reduced end 22which extends into the slot I5 in the piston and 40 carries a roller 23.

The top of the shell is closed by a cap 24 and extending upwardlythrough this cap is a stud 25 of an actuator 26, which corresponds indiameter to the internal diameter of the piston, and

45 this actuator is formed with a spiral groove 21 into which the pin I9extends, so that the roller 20 thereon will travel when the actuator isturned,

as in the opening or closing of the door.

Afiixed to the stud 25 is an operating-arm 28, which is pivoted to anoperating-arm 29, which, in turn, is pivoted toa bracket 30, in theusual manner of door-checks of this type.

Within the piston is a spring 3I bearing upon 55 the bottom of thepiston and against the lower and not liable to become deranged.

end of the actuator, and this piston is filled with fluid 32.

Preferably, around the casing at the upper end is a spring 33, one end34 of which enters a recess for it in the casing, while the other end 35.is 5 hooked over the arm 28.

As shown in Fig. 2 of the drawing, the parts are in the positions theyassume when the door is in its closed position. Opening the door movesthe arm 28 so as to turn the stud 25 and rotate the actuator 26, causingthe piston I2 to rise, this piston being held against rotation by theplug 2 I, and as the piston rises, the spring 3| is compressed and thefluid escapes through the port I3, the valve I4 yielding for free escapeof the liquid, so that the liquid-passes into the bottom of the shell.

When the door is released, the expansion of the spring 3| will tend toforce the piston downward, in which case the spring I4 closes theopening I3, 0 and the liquid is forced through the by-pass l1 andthrough the opening I6 into the piston. The area of this by-pass may beregulated by the screw 36, the downward movement of the piston rotatingthe actuator 26 and so moving the door to the closed position, and thismovement is accelerated by the spring 33.

This invention thus provides, with few parts,

a door-check which will be positive in its action It will be understoodby those skilled in' the art that this invention may assume variedphysical forms without departing from the inventive concept and theinvention, therefore, is not limited to the specific embodiments hereinchosen for illustration.

I claim:

A door-check comprising a shell adapted to be mounted upon a door, acup-shaped piston 40 closely fitting said shell and axially movabletherein, said piston formed on one side with a longitudinal slot and onthe opposite side with an opening. means to prevent the rotation of thepiston, a Icy-pass intersecting said opening, a pin mounted in saidpiston opposite the slot, an actuator closely fitting said piston andformed with a spiral groove into which the said pin extends, saidactuator being formed with a stud extending through the casing, armsconnecting the stud with the door-casing, a spring seated in said pistonand bearing against the lower end of the actuator so as to be depressedthereby, and a valve-opening in the bottom of the piston.

. MARCUS B. HEMINGWAY.

